﻿#region License
// Copyright 2010 Microsoft Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace MediaWiki.Common
{
  public static class CollectionExtensions
  {
    /// <summary>
    /// Adds the elements of the specified collection to the specified generic IList.
    /// </summary>
    /// <param name="initial">The list to add to.</param>
    /// <param name="collection">The collection of elements to add.</param>
    private static void AddRange<T, U>(this ICollection<T> initial, IEnumerable<U> collection) where U : T
    {
      ValidationUtils.ArgumentNotNull(initial, "initial");

      if (collection == null)
        return;

      foreach (U value in collection)
      {
        initial.Add(value);
      }
    }

    /// <summary>
    /// Adds the elements of the specified collection to the specified generic IList.
    /// </summary>
    /// <param name="initial">The list to add to.</param>
    /// <param name="collection">The collection of elements to add.</param>
    public static void AddRange<T>(this ICollection<T> initial, IEnumerable<T> collection)
    {
      AddRange<T, T>(initial, collection);
    }
  }
}